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+A `yield` clause was used in an `async` context.
+
+Erroneous code example:
+
+```compile_fail,E0727,edition2018
+#![feature(generators)]
+
+fn main() {
+    let generator = || {
+        async {
+            yield;
+        }
+    };
+}
+```
+
+Here, the `yield` keyword is used in an `async` block,
+which is not yet supported.
+
+To fix this error, you have to move `yield` out of the `async` block:
+
+```edition2018
+#![feature(generators)]
+
+fn main() {
+    let generator = || {
+        yield;
+    };
+}
+```